Domain adaptation for semantic segmentation aims to improve the model performance in the presence of a distribution shift between source and target domain. Leveraging the supervision from auxiliary tasks~(such as depth estimation) has the potential to heal this shift because many visual tasks are closely related to each other. However, such a supervision is not always available. In this work, we leverage the guidance from self-supervised depth estimation, which is available on both domains, to bridge the domain gap. On the one hand, we propose to explicitly learn the task feature correlation to strengthen the target semantic predictions with the help of target depth estimation. On the other hand, we use the depth prediction discrepancy from source and target depth decoders to approximate the pixel-wise adaptation difficulty. The adaptation difficulty, inferred from depth, is then used to refine the target semantic segmentation pseudo-labels. The proposed method can be easily implemented into existing segmentation frameworks. We demonstrate the effectiveness of our proposed approach on the benchmark tasks SYNTHIA-to-Cityscapes and GTA-to-Cityscapes, on which we achieve the new state-of-the-art performance of $55.0\%$ and $56.6\%$, respectively. Our code is available at \url{https://github.com/qinenergy/corda}.

本文介绍了一种基于自监督深度估计来缩小源域和目标域之间领域漂移的方法，该方法旨在增强目标语义预测，并使用深度预测的差异来明确像素级适应难度，进而修正目标语义分割伪标签。在SYNTHIA-to-Cityscapes和GTA-to-Cityscapes基准任务上，我们分别实现了55.0％和56.6％的新的最先进性能。

自监督深度估计中的域自适应语义分割